HPE SP# P39778-001 PXLLP0ARHFN08C 2SFF (SMALL FORM FACTOR) SAS/SATA UBM2 BACKPLANE P28077-001 T268647

This is a 2SFF (Small Form Factor) SAS/SATA UBM2 Backplane. Specifically, it is the board used in the rear drive cage or the front premium cage of the HPE ProLiant DL380 Gen10 Plus server. The AS# P20884-001 is the assembly number found on the PCB itself. This board allows you to add two additional 2.5" drives to your server, which is commonly used to create a mirrored boot volume (RAID 1) while leaving the main front bays open for high-capacity data storage.